Kinematics Analysis Of Throwing Technique Of Young Amateur Chain Ball Players In Xi’an City

Objective:In this paper,we analyze the kinematics of the two in-team test matches of amateur young and male chain ball players through image analysis,and further understand the development of the technology.According to the characteristics of modern chain ball technology and the analysis of the throwing results and the analyzed data,we summarize the kinematics characteristics of the throwing technology,hope to find out the advantages and disadvantages of the chain ball technology,and put forward some suggestions and suggestions for further improving the technical action of the chain ball,Constantly improve the technical movements in the throwing process,make them master the reasonable and standardized chain ball technology,lay a solid foundation for the further improvement of their technical level in the future,and at the same time,learn from each other in the process of training.Then improve its technical level,promote the development of amateur youth chain ball movement.Methods:This research mainly uses the literature data method,the analysis method and the mathematical statistics method to carry on the analysis diagnosis processing to the selected six young amateur chain ball athletes two in-team test competition rotation technique and the final hand technique.Findings:(1)Young men Zhang **,Liu ** and women Zhang ** and Li ** had shorter rotation times in the first lap than in the second lap in the two internal matches.The time decline rate of two to three laps is small,the total double support time of young men and women is less than 50%,and the ratio of single and double support is less than 1.(2)The overall speed extremum difference in the rotation stage of young men and women spikers is large,the overall value of the ball speed increment in the last lap of young men and women spikers is small,and the second > the fourth > the third > the first lap of young men Liu * for the second time.(3)The overall trunk inclination angle of young men and women spikers is larger,and the values of shoulder and hip angle of young men Liu * and Zhang * are larger,especially Zhang *.(4)The difference between the height of the center of gravity of young men and women is large.The difference between the maximum and the minimum of young men’s chain ball players is 8.18±2.03 cm,the difference between the minimum and the maximum of Zhang * is 10.4 cm,and the difference between the maximum and the minimum of women’s chain ball players is 9.85±1.83 cm.(5)Young men and women spikers showed poor rotation radius,and the length of single support trajectory was shorter than that of double support trajectory.(6)Young men and women have a higher shot angle,while men’s Zhang,Liu and women’s Zhang have a lower shot angle of 45,46 and 49 respectively.Conclusions:(1)In terms of time: six youth men and women chain ball players have poor rotation rhythm,from the odd and even support time ratio,only period * * consistent with its previous theory,the remaining five chain ball players more or less odd support time less than 1,concentrated in the first circle,odd support time distribution unreasonable,unreasonable rotation stage technology phenomenon,is not conducive to the acceleration of the chain ball.(2)In terms of speed:six young men and women chain ball players increase the ball speed in the rotation stage,but the rotation speed extreme difference is large,indicating a large speed loss and its weak ability to continue acceleration.(3)From the point of view: better torso inclination is conducive to increase its radius of rotation,through research found that youth men chain ball players trunk elevation is more serious,will lead to coordination with the chain ball,but young women chain ball players also exist this phenomenon,larger shoulder and hip angle can promote torso torsion,youth women’s right foot off the ground shoulder and hip circle increases,beneficial to the acceleration of the chain ball,youth men shoulder and hip angle numerical performance is poor,poor torso torsion,is not conducive to improve the rotation rhythm of the chain ball.(4)In terms of the center of gravity height:shorter track length is not conducive to the distance of the chain ball,and affect the chain ball throw distance,youth men’s chain ball players segment * * two internal test rotation track length is ideal,youth men and women chain ball players first circle rotation radius is generally short,the first circle double support track length is short,even shorter than the single support track length,affect the subsequent chain ball acceleration,is not conducive to the chain ball.(5)In terms of the trajectory: young male and female chain ball players rotation stage of the center of gravity fluctuation is large,which is not conducive to the rhythm of the chain ball rotation.(6)From the hand side point of view: shot speed,Angle,height has the decisive role to throw distance,six youth chain ball players generally wide Angle,except section * * and zhang * *,two athletes,other athletes have the phenomenon of too low,through research,the athletes throw chain ball and speed showed an obvious positive correlation.